Cable unit for connecting devices to enable wireless exchange of data and/or power between them

1. Cable unit for connecting a first and a second devices in a system, in particular in a patient monitoring system, to enable wireless exchange of data and/or power between them, said cable unit comprising: a cable and a connector arranged at each end of said cable, said connector comprising a data transmission unit for transmitting data to and/or receiving data from the first device having a counterpart connector and a magnetic coupling unit for transmitting power to and/or receiving power from the second device of the system having a counterpart connector by use of inductive coupling.

2. Cable unit as claimed in claim 1 , further comprising a second connector arranged at least at one end of said cable for simultaneously transmitting data to and/or receiving data from the first and second devices (or from the first and a third devices, or from the second and a third devices, or from a third and a fourth devices) and/or for simultaneously transmitting power to and/or receiving power from these two devices.

3. Cable unit as claimed in claim 1 , further comprising a sealed housing arranged at each end of the cable, in which the one or more connectors arranged at the respective end of the cable are arranged.

4. Cable unit as claimed in claim 3 , wherein said sealed housing is configured to allow stacking of the cable unit to a counterpart connectors.

5. Cable unit as claimed in claim 1 , further comprising electronic circuitry for data processing, conversion and/or storage of received data.

6. Cable unit as claimed in claim 1 , further comprising a detection unit for detecting the strength of magnetic coupling between the magnetic coupling unit and a magnetic coupling unit of the second device, and a control unit for switching the data transmission unit into a low-power mode and/or for enabling the magnetic coupling unit, if the detected magnetic coupling is above a first threshold and/or its increase is above a second threshold, and for switching the data transmission unit into a high-power mode and/or for disabling the magnetic coupling unit, if the detected magnetic coupling is below a third threshold and/or its decrease is above a fourth threshold.

7. Cable unit as claimed in claim 1 , wherein said data transmission unit is configured for transmitting data by use of RF transmission, optical transmission, capacitive coupling or near field communication.

8. Cable unit as claimed in claim 1 , wherein said connector further comprises a carrier, wherein said data transmission unit comprises an RF antenna arranged in or on the carrier and an RF circuit for driving the RF antenna and/or obtaining RF signals received by the RF antenna.

9. Cable unit as claimed in claim 1 , wherein said magnetic coupling unit comprises a flux concentrator for concentrating magnetic flux and one or more coils arranged around part of the flux concentrator.

10. Cable unit as claimed in claim 3 , wherein said magnetic coupling unit comprises: a ring-shaped flux concentrator, at least part of which having a U-shaped cross-section comprising two legs and forming a recess between the legs of the U, a first coil arranged within a recess of the flux concentrator, and a second coil arranged outside of the recess in which the first coil is arranged, wherein the sealed housing is arranged to allow stacking of the cable unit upon other devices having a counterpart connector so that the first coil of the connector and a second coil of a connector stacked upon the connector together form a first transformer for inductive power transmission there between and/or the second coil of the connector and a first coil of a third connector stacked upon the connector together form a second transformer for inductive power transfer there between.

11. Cable unit as claimed in claim 1 , wherein said cable comprises a pair of twisted wires between the magnetic coupling units of the connectors.

12. Cable unit as claimed in claim 1 , wherein said cable comprises a coaxial cable or balanced transmission line between the data transmission units of the connectors.

13. Cable unit as claimed in claim 1 , further comprising a proximity detector for detecting proximity of the cable unit another device and a control unit for switching the data transmission unit into a low-power mode and/or for enabling the magnetic coupling unit, if a device is detected to be proximate to the cable unit, and for switching the data transmission unit into a high-power mode and/or for disabling the magnetic coupling unit, if no device is detected to be proximate to the cable unit.